please help me find the principle and workings of mixer grinder

the principle of mixer grinder

Different types of Juicer/Mixer/Grinders are available in the market. Authors developed an innovative Prototype Model of Electro- Mechanical Juicer-Mixer Grinder, which comprises an integrated electrically driven power transmission system as well as manual power transmission system. This innovative Juicer-Mixer-Grinder is more useful for rural areas and it is also useful for urban areas. It can work even at the time of power cut or power failure. A lot of electrical energy can be saved by using this Juicer-MixerGrinder in manual mode.